Cyclopentadienyl anion

Cyclopentadienyl anion
Names
	IUPAC name Cyclopentadienide
Identifiers
CAS Number	12127-83-2;
3D model (JSmol)	Interactive image;
ChemSpider	2731064;
PubChem CID	3490527;
	InChI InChI=1S/C5H5/c1-2-4-5-3-1/h1-5H/q-1 Key: SINKOGOPEQSHQD-UHFFFAOYSA-N; InChI=1/C5H5/c1-2-4-5-3-1/h1-5H/q-1 Key: SINKOGOPEQSHQD-UHFFFAOYAD;
	SMILES [cH-]1cccc1;
Properties
Chemical formula	[C; 5H; 5]−; or Cp−
Molar mass	65.09 g/mol
Conjugate acid	Cyclopentadiene
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

In chemistry, the cyclopentadienyl anion or cyclopentadienide is an aromatic species with a formula of [C
₅H
₅]⁻
and abbreviated as Cp⁻. It is formed by the deprotonation of cyclopentadiene. The cyclopentadienyl anion is a ligand which binds to a metal in organometallic chemistry.

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